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MYTF's Haynes V6 RX-7 build
https://www.locostusa.com/forums/viewtopic.php?f=35&t=6245		 Page 25 of 26
Author:  MYTF [ June 16, 2022, 10:13 pm ]
Post subject:  Re: MYTF's Haynes V6 RX-7 build
I had some problem with the fuel management the car was running very rich so to eliminate the pressure regulator as the culprit I hooked up a pressure gauge.
I've been cleaning up the tune, making adjustments here and there. Fixed the acceleration stumble and the coolant temp gauge.
I got a gopro from my son inlaw and did some MicroSquirt data logging. I am editing the video and will post later.
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Author:  Miatav8,MstrASE,A&P,F [ June 22, 2022, 5:52 am ]
Post subject:  Re: MYTF's Haynes V6 RX-7 build
Great video, thanks for sharing! She will remember that forever. :cheers:

I guess the cluster came from a 4 cyl car?
Author:  MYTF [ June 22, 2022, 9:02 am ]
Post subject:  Re: MYTF's Haynes V6 RX-7 build
Actually the cluster came from the doner which was an RX7. You would think that two rotors x three lobes would similar to a six cylinder conventional but because of the eccentrics the two rotor Wankel fires twice every revolution as opposed two three times for a six cylinder.
Author:  Miatav8,MstrASE,A&P,F [ June 22, 2022, 9:43 am ]
Post subject:  Re: MYTF's Haynes V6 RX-7 build
You can correct it with a resistor and a battery charger. Check out my zuki tracker v6 swap if you'd like to see how I did it. Works great. No issues.

I did have an unrelated issue where it would not shut off after starting, without the alternator connected at all. No power on the ignition before turning the key. Turned out to be backfeeding the oil pressure switch for the fuel pump through the computer to the ignition. Had to use keyed power for the oil pressure switch instead of the factory s10 schematic wiring.
Author:  MYTF [ June 22, 2022, 10:02 am ]
Post subject:  Re: MYTF's Haynes V6 RX-7 build
I will check that out. Thanks
Author:  MYTF [ July 11, 2022, 10:07 pm ]
Post subject:  Re: MYTF's Haynes V6 RX-7 build
Well, I went to a local autocross and found the car oversteers much more then I was expecting. So I am installing the front anti roll bar that I have. I'm not to optimistic that it will be big enough, time will tell.
I have a video of the autocross.
[youtube]https://youtu.be/ppHciMN83oI[/youtube]

With the oil pressure gauge not working after cleaning and checking, the water temp gauge questionable, and the tach needing some work I am working on a digital dashboard. I bought a old Panasonic Tough Pad to run Tunerstudio. I am working on the dash surround now.
Author:  Lonnie-S [ July 12, 2022, 10:19 am ]
Post subject:  Re: MYTF's Haynes V6 RX-7 build
Very interesting, John. Sometimes it sounded like the rear end was just breaking loose under throttle. But, sometimes it just looked like the front wanted to turn, but the rear axle wasn't getting the memo.

One thing said my a handling expert that stuck with me is (paraphrasing), "the key to handling is getting both ends of the car wanting to do the same thing together at the same time." Of course, that's the hard part.

Good on ya for being brave enough to try autocross out this early on. You've only had it going for a little bit now.

Cheers,
Author:  MYTF [ July 12, 2022, 10:50 am ]
Post subject:  Re: MYTF's Haynes V6 RX-7 build
Thanks Lonnie,
Yes the car is a long way from neutral handling I thought that would be the case just driving around the neighborhood with a neutral throttle the rear had a tendency to step out. I'm waiting for a couple of links for the anti roll bar and I put in some more negative camber in the rear. Went from 0.5º to 1.5º
I am setting up the roll bar with three adjustment points and the A-arm with two to fine tune but as I said I may need a larger bar.
Author:  a.moore [ July 12, 2022, 4:43 pm ]
Post subject:  Re: MYTF's Haynes V6 RX-7 build
Have you tried driving around in circles in a parking lot at a constant speed and seeing which end breaks away first? Springs and bars control steady state - you rarely achieve a good steady state on an autocross course since they tend to be tight and quick.
Author:  MYTF [ August 21, 2022, 11:22 am ]
Post subject:  Re: MYTF's Haynes V6 RX-7 build
Sorry a.moore for not responding to your response :? I don't have easy access to a large parking lot as my car is not licensed yet. I have one corner in the non built area of the neighborhood that I can drive off, on, or neutral throttle and get a feel for the car. I got the links had to send them back as the length was to long (diagram showed center to center of rod ends, links were that length) installed them. What a difference! Just attended another autocross and with the bar in the softest setting the oversteer was only a slight amount unless under power. On my last run I moved to the firmest setting and added 4 seconds to the run as I had terrible understeer. These things really work. :wink:
I had to replace my dash as I couldn't get the oil gauge to work at all and the water temp was reading low even after cleaning adjusting and testing. The old one was from the doner car (1986 RX7). I am trying a digital dash using information from the Megasquirt. I got a Panasonic Tough Tablet at a good price and a Qstarz GPS receiver and am still trying to get the gremlins out. You must have really good connections! This is a car based on a British car after all. :roll: I may have to install The old speedo as it was working perfectly.
Author:  KB58 [ August 21, 2022, 1:09 pm ]
Post subject:  Re: MYTF's Haynes V6 RX-7 build
MYTF wrote:
I had some problem with the fuel management the car was running very rich so to eliminate the pressure regulator as the culprit I hooked up a pressure gauge. I've been cleaning up the tune, making adjustments here and there. Fixed the acceleration stumble and the coolant temp gauge.
...

I had a shop do the basic ECU tune (fuel and timing for full throttle), then I handled tuning it to run like an OEM engine (partial throttle, cruising, idle, not stalling when coming to a stop, etc), and that took months.
Author:  FastG [ August 22, 2022, 7:41 am ]
Post subject:  Re: MYTF's Haynes V6 RX-7 build
That sure is tail happy. What tires do you have on it? The way the tires squealed in the 1st to 2nd change and even when you were braking at the end on the final run makes me wonder.
Author:  Miatav8,MstrASE,A&P,F [ August 22, 2022, 7:29 pm ]
Post subject:  Re: MYTF's Haynes V6 RX-7 build
MYTF wrote:
I had to replace my dash as I couldn't get the oil gauge to work at all and the water temp was reading low even after cleaning adjusting and testing. The old one was from the doner car (1986 RX7).


Grounding the sensor lead should swing the gauge. A variable resistor can be added in series to calibrate the reading, similar to what I did with the geo tracker 4cyl tach cal for the v6. I understand there were two different sensors for the OP, one for a light (should be very small) and one for a gauge (probably about 1-1/2 to 2 inches in od).

There probably is a voltage regulator for the cluster that keeps alt output from skewing the indications.
Author:  MYTF [ August 24, 2022, 10:57 am ]
Post subject:  Re: MYTF's Haynes V6 RX-7 build
First to answer a few questions.
KB58; It's running much better now I hate to admit it but the rich running was from the disconnected MAP line that I had forgotten reconnect. :oops:
FastG; The tires are 205/50R 16 with a wear ratting of 320. Definitely not track tires and were bought for the original purpose of cruising the country side not autocross.
Miatav8,MstrASE,A&P,F; I looked over the wiring schematic and couldn't see anything that would cause the problem. It's academic now as the new dash is in and working adequately.
I'm working on putting a mini windshield (deflector) on and side view mirrors. I am hopping to get the car licensed without installing wipers. We will see.
I bought some windshield stanchions from Jack and used them as a guide to make shorter ones from aluminum so if I need to go with a full size windshield I can use the same holes in the shuttle.
For now I'm going to start with a tall piece of plywood and test drive. Cutting down till I get wind in the face then go back to the previous height and transfer to Lexan.
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SideView Mirror 2.jpg
Author:  MYTF [ October 6, 2022, 6:13 pm ]
Post subject:  Re: MYTF's Haynes V6 RX-7 build
I got the new dash working sort of. I am using a old Panasonic Tough Tablet running windows. The four screws below the screen are extensions for the buttons
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Tablet Dash.jpg

I was getting erratic readings from the oil pressure sensor and O2 sensor. I got the O2 sensor reading smoothed out by wrapping the header. I had a slip joint just up from the sensor and fresh air was being sucked in on deceleration and confusing the sensor. The wrap seems to have done the trick. O2 sensor readings are nice and stable.
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Exhaust Wrap.jpg

The oil pressure reading is still erratic, I think some of my wires are to close to the plug wires or it is a grounding problem. For now I hooked up a analog oil pressure and water temp gauge to double check and calibrate the MegaSquirt.
I started on the front fenders. I built a mold and made up one fender but my limited experience with mold making really showed up when I tried to remove the fender and the mold broke apart. The fender is in good shape so I am going to clean it up an use it to make a two part fiberglass mold that should come off easier.
I also made a former for the oval tubing I am going to use for the fender supports. This is the same method I used to form the lower control arm tubing.
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F Fender Blank S.jpg

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Fender Support Former.jpg

It looks like I forgot to mention I installed the front antiroll bar I already had and the car corners neutral.
I went to another autocross and with the bar on the stiffest setting the car understeers bad, in the softest setting it oversteers just slightly.
As a side note I attended my first track day at Thunder Hill in Willows, CA on Sept. 10th. I only wanted to do this for about 50 years!
I haven't had that much fun in a long time. :7: :drive: :D :D :D
One issue I had was from the elevation change. I had used TunerStudio autotune feature and it did a good job but I live at 5,000 feet and the track is at 140 feet so the VE table had not been tuned above 85kPa and that area was very rich. Every time I opened the throttle to far the engine would cut out and I was to dense to figure it out till I got home.
I am going back Oct. 15th and try again.
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